thompson



T. THGMPSON.

LOCK. FPUCATION FILED FEB. lll 1919.

Patented July 22, 1919.

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Ano/mfr T. THOMPSON.

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APPLICATION FILED FEB. II. T919- 1,3 1 1, 102. Patented July 22, 1919. A 3 sains-SHEET 2.

(Hi/go? WITNESSES.' 7S INI/5N TOR T. THOMPSON,-

LocK.

fAPPLIGATIONfILED FEB. Il. 1919.

Patented July 22, 1919.

3 SHEETS-SHEET 3.

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THOMAS THOMPSON, OF MAKOTI, NORTH DAKOTA.

Frio.

LOCK.

' To all whom it may concern.'

Be it known that I, THOMAS THOMPSON, a citizen of the United States, residing at Makoti, in the county of Ward and State of North Dakota, have-invented new and useful Improvements in Locks, of which the following is a specification.

This invention relatesk to locks, particu? larly to locks for slidingdoors such as are used on boX cars, and has for its Object the lprovision of a lock including a stationaryV eeper member and a pivoted latch member associated with and engageable with the keeper member having a cam movement in relation thereto, whereby movement of the latch member into Voperativev engagement with the keeper member will move the door upon which the lock is disposedinto very closeengagement with the j amb tight closure will be provided.

An important obj ect is the provision of a lock of this character embodying a keeper member formed of two sections, one being stationary and the other movable,.and` furwhereby a ther embodying a latch member formed in two sections, one of which is engageable upon the stationary sections of the keeper and the other of which is engaged by the movable section of the keeper, the movable section of the keeper being held in position by a pad lock or by a seal whereby the parts of the lock will be so held in interengaged osition that successful tampering therewith by unauthorized persons will be reduced to the minimum.

,A further object is the provision of a lock of this character in which movement of the latch member into engagement with the keeper will cause a cam like action betweenthe latch member and the keeperresulting'in firmly sition.

wedging the door into its closed po Another object is the provision of a lock of this character which .will be compara; tively simple and inexpensive in manufac-V ture, secure in its holding properties, highly efiicient and dura-ble in service, and a general improvement of the art. j

With the above and otherobjects and ad-i vantages in view, the invention consists'in the details of construction to be hereinafter more fullyV described `and claimedl and illustrated in the accompanying drawings in` which p Figure 1 is a front elevation of a door and i VSpecication of Letters Patent.

Patented July 22, 1919.

Application led February 11, 1919. Serial No. 276,290.

moved,

Fig. 4 isa longitudinal sectional view on the line 4 4 of Fig. 1,

Fig. 5` is a similar view on the line 5--5 of Fig. 2,

Fig. 6 is a similar view on the line 6-6 of Fig. 3,

Fig. 7 is a front elevation similar to Fig. 1 showing the latch member swung to its entirely disengaged position,

Fig. 8 is a longitudinal sectional view on the line 8*8 of Fig. 7,

Fig. 9 is a sectional view through the door-onthe line 9-9 of Fig. 1 showing the locking mechanism in side elevation,

Fig. l0 is a cross sectional view, on the line 10-10 of Fig. 5, and Fig. 11 is a fragmentary elevation of the inner face of the latch member. Y

Referring more particularly to the drawings the letter A designates the side of a boX car or building provided with a dooi opening B closable by asliding door() supported in any suitable trackways.

In carrying out my invention I provide upon the jamb D a keeper member designated broadly by the `numeral 15 comprising a flat base portion 16 having extending therefrom a curved head 17 undercut as shown at 18 adjacent the base 16 to provide a projecting portion 19.

Secured upon the door C is a latch casing designated broadly by the numeral 20 comprising a back wall 21 from which extend side walls 22 and 23. The casing 20 is disposed in alinement with the keeper l5 andV has one end terminating at the edge of the door C. The ends of the side walls 22 and 23 adjacent the keeper 15 are provided with undercut notches 24 for a purpose to be here inafter described. Pivoted between the other ends ofthe side walls 22 and 23 as shown at 25is a latch member including two sections 26'and 27.

The 'latch member' 26 includes a rectangular bar v28 disposable between the side walls 22 and 23 of the-latch casing 20 and further f. Ydimensions than the keeper 15 and being so includes a substantially rectangular head 29 secured upon the end of the bar 28 adjacent the keeper 15. The underside of the headf29 is provided with a recess 30having curved walls, as shown, the recess being of greater formed as to provide aprojecting portion 3l adapted to engage within the undercut portion 18 of the keeper. Secured upon the underside of the bar 28 at a point spaced from the head. 29 is a substantially frustopyramidal block 32 disposable within an opening 33 in the back wall 21 of the latch member casing and engageable within correspondingly formed recess 34 having un` dercut sides as shown.

The section 27 of the latch member includes a bar 35 provided at one end with a centrally disposed tongue 36 through which the pivot pin 25 passes `and which is disposed Within a bifurcation 37 in the outer end of the bar 28. The sections 26 and 27V of the latch member are connected by a pivot pin 38 which extends' through the bifurcated portion of the bar 28 and through the tongue 36 on the section 27. The pivotal connection 38 between the sections 26 and 27 of the latch member is such that when the bar 35 is swung toward or away. from the bar 28 the bar 28 will be moved in a rectilinear course as will be hereinafter explained. llxtending from one side ol the bar 35 is a lug 39 serving as a handle and engageable within a notch 4() formed in the side wall 23 of the latch casing. The free end of the bar 35 is cut away as shown at-41 so that the major portion thereof will be flush with the edges of the notches 24 in the side walls 22' and 23. v

tion 41 oi the bar 35 and beveled portions 46` engageablewith the undercut notches 24 in the side walls 22 and 23 of the latch casing.

The operation of the lock is as follows,`

lVith the parts of the lock disposed in the position shown in Fig. 1 ofthe drawings, in

order to open the door, it is first necessary to grasp the handle 44 and swing the plate 42 upon its pivot 43 until its end portions 45 and 46 are disengaged from the cut away,

portions 41 and notches 24 respectively, as shown in Fig. 2. The operator thengrasps the lug 39 and swings the bar 35 outwardly away from the bar 28 into the position shown in Figs. 3 and 6 of the drawing. Owing to the peculiar arrangement of the pivot pin 38 connecting the sectionsf26 and 27 of a latch member, outward movement of the bar 35 in respect to the bar 28 will result in a rectilinear movement 0f the bar 28 over the face of the door C. As this rectilinear movement of the bar 28 is limited by the engage ment of the wall of the recess 30 with the head 17 of the keeper 15, the door C will be moved a slight distance away from the jamb B as shown in Figs. 2 and 4 of the drawings. The bar 28 is however moved a sufficient degree that the projecting-portion 31 within the recess 30 in the head 29 will be disengaged from the undercutJ lportion 18 of the head 17 of the keeper 15. Continued outward swinging movement of the bar 35 upon the pivot pin 25 will result in outward swinging movement of the bar 28 so that the head 29 will be entirely disengaged from the keeper 15. The parts will then assume the position shown in Figs. `7 and 8 of the draw ings andthe d-oor C may then be slid to its open position. It will of cou-rse be seen that when the bar 28 is given its rectilinear movement, the block 32 will be movedV out of engagement within the recess 34 in the back wall 21 of the latch casing and will be disposed within the relatively large opening 33 in the back wall.

The door being open and the parts of the lock being disposed in the position shown in Figs. 7 and 8 of the draavings, in order to lock the door it is lirst necessary to slide the door into substantially close engagement with the j amb B. Thebar 28 is then swung upon the pivot pin 38 until the head 29 is disposed over the keeper 15. At this time, the projecting portion 31 within the recess of the head 29 will be disposed in proximity to, but out of contact with the projection 19 ot' the head 17 oi the keeper. The operator then gif'asps the lug 39 and swings the bar 35 until it lies upon the bar 28, whereupon the eccentric ypivot connection 38 between the bars 28 and 35 will result in rectilinear movement of the bar 28 yover the face of the door, the head 29 being moved toward the edge of the door. This movement of the head 29 causes the projecting portion 31 within the recess 30 to engage within the undercut portion 18 of *the keeper head 17. The projecting portion 19 of the head is then disposed within the recess 30 and the head 29 isV fixed in relation to the keeper.` YVhen the bar 35 is disposed* in close engagement upon the bar 28, the lug 39 will be seated within the notch 40 in the sidewall 23 of the latch casing and the cutaway portion 41 at the free end of the bar 35 will be in substantial alinement with the notchesl 24 in the side walls 22 and 23. The operator then grasps the handle44 upon the locking plate 42 and swings the locking plate upon its pivot 43V until its beveled portions `46 are engaged within the notches 24 and its central portion 45abuts against the edge of the cut away portion 41 of the bar 35. Further movement of the plate 42 is prevented.

In order to secure the locking plate 42 upon the head 29so that it may not be moved by an unauthorized person, I provide the plate 42 with a slot or hole 47 registering with a similar slot or hole 48 in the edge of the head 29 when the plate 42 is swung to its locking position. The usual seal 49, or a pad lock is desired, if then inserted and secured through the holes 47 and 48.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided a lock whereby a sliding door such as used on box cars or in other locations may be quickly and easily locked to prevent the entrance of unauthorized persons, or unlocked by the proper parties, the lock providing means whereby a seal may be secured in respect thereto and including the provision of a latching member having rectilinear movement in respect to a keeper member wherebyY a cam effect will be produced for urging the door to its. closed position for effecting a tight closure.

While I have shown and described the preferred embodiment of my invention, it will of course be understood that I reserve the right to make such changes in the form, construction and arrangement of parts as will not depart from the spirit ofthe invention nor the scope of the subjoiiied claims.

Having thus described my invention, I claim:

1. A sliding door lock comprising a keeper secured upon the door jamb and provided with anundercut portion, a casing secured upon the door, a latch member disposed for pivotal and sliding movement within said casing, a head carried by said latch member and provided with a recess for the accommodation of said keeper, a projection within said recess, means pivoted within said casing for imparting a rectilinear movement to Vsaid latch member whereby said projection will be engaged within the undercut portion of said keeper, and means .carried by said head and engageable with said last named means for preventing movenient of said latch member operating means. 2. A sliding door lock comprising akeeper Copies of this patent may be obtained for five cents each, by addressing the secured upon the door jamb and provided with an undercut portion, a casing secured upon the door, a latch member disposed within said casing and arranged for pivotal and sliding movement, a head carried by said latch member and provided with a recess for the accommodation of said keeper, a projection within said recess, a bar pivotally connected with said casing and with said latch member whereby rectilinear movement may be imparted to said latch member to engage said projection within the undercut portion of said keeper, l25nd means for preventing movement of said 3. A sliding` door lock comprising `a keeper secured upon the door jamb and provided with an undercut portion, a casing secured upon the door, a latch member arranged for pivotal and sliding movement within said casing, a head carried by said latch member and provided with a recess for the accommodation of said keeper, a projection within said recess,`a bar pivoted within said casing and connected with said latch member outward swinging of said bar causing rectilinear movement of said latch member over the face of the door whereby said projection will be engaged within the undercut portion of said keeper, and means carried by said head and engageable with said bar whereby outward swinging of said bar will be prevented.

4. A sliding door lock comprising a keeper secured upon the door j amb and provided with an undercut portion, a casing secured upon the door, a latch member disposed for pivotal and sliding movement within said casing, a projection on said latch member, j,

a bar pivoted within said casing and pivotally connected with said latch member whereby outward movement of said bar will impart longitudinal movement to said latch member to engage said projection within the undercut portion of said keeper, and a locking plate pivoted upon said latch member and movable into engagement with said bar whereby outward movement of said bar will be prevented.

In testimony whereof I aiiix my signature.

THOMAS THOMPSON.

Commissioner of Patents,

Washington, D. G. 

